Have a look at the following XEP which I worked on in the past: http://www.xmpp.org/extensions/xep-0101.html
If I am getting what you are trying to do correctly I think this is the sort of thing you might be after.
- [Standards] Authorization over HTTP anders conbere
- Re: [Standards] Authorization over HTTP Richard Dobson
- Re: [Standards] Authorization over HTTP Tomasz Sterna
- Re: [Standards] Authorization over HTTP anders conbere
- Re: [Standards] Authorization over HTTP anders conbere
- Re: [Standards] Authorization over ... Dave Cridland
- Re: [Standards] Authorization ... anders conbere
- Re: [Standards] OpenID for... Tomasz Sterna
- Re: [Standards] OpenID... anders conbere
- Re: [Standards] Authorization over HTTP Tomasz Sterna
- Re: [Standards] Authorization over ... Kevin Smith
- Re: [Standards] Authorization ... Michal 'vorner' Vaner
